Barron Trump, 10, will become the first boy since John F Kennedy Jr to live in the White House.

Born the year after Donald Trump’s marriage to Melania, the youngest Trump’s name appears to have emerged from a preferred pseudonym of Mr Trump. For three decades, until the 1990s, "John Miller" and "John Barron", two public relations men, loved to boast to journalists of Mr Trump's success with business and women.

Barron has spent his life living in Trump Tower, where he has a whole floor to himself – close to his grandparents. He speaks Slovenian with them and with his mother.

He also takes after his mother – she lavishes him with her own-brand caviar moisturizer, and ensures that he is always dressed in suit and tie.

He currently attends the private Columbia Grammar and Preparatory School, in Manhattan, but could end up a pupil at Sidwell Friends – a school which has for the past 35 years educated all the children of presidents. Others, however, speculate that he could actually remain in New York with his grandparents and stay at the same school.